Exodus 12:15-19

MLV(i) 15 Seven days you* will eat unleavened bread, even the first day you* will put away leaven out of your* houses, because whoever eats leavened bread from the first day until the seventh day, that soul will be cut off from Israel.
16 And in the first day there will be to you* a holy convocation and in the seventh day a holy convocation, no manner of work will be done in them, except what every man must eat, that only may be done by you*.
17 And you* will observe the feast of unleavened bread, because in this same day I have brought your* armies out of the land of Egypt. Therefore you* will observe this day throughout your* genealogy by an everlasting ordinance.
18 In the first month, on the fourteenth day of the month at evening, you* will eat unleavened bread, until the twenty-first day of the month at evening. 19 Seven days there will be no leaven found in your* houses, because whoever eats what is leavened, that soul will be cut off from the congregation of Israel, whether he is a traveler, or one who is born in the land.